CN106740567B - Over-discharge preventing device and method for vehicle battery - Google Patents

Over-discharge preventing device and method for vehicle battery Download PDF

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Publication number
CN106740567B
CN106740567B CN201610552129.2A CN201610552129A CN106740567B CN 106740567 B CN106740567 B CN 106740567B CN 201610552129 A CN201610552129 A CN 201610552129A CN 106740567 B CN106740567 B CN 106740567B
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vehicle
battery
relay
controller
voltage
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CN106740567A (en
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朴贤秀
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Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B60L1/003—Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/12—Recording operating variables ; Monitoring of operating variables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2250/00—Driver interactions
    • B60L2250/10—Driver interactions by alarm
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S903/00—Hybrid electric vehicles, HEVS
    • Y10S903/902—Prime movers comprising electrical and internal combustion motors
    • Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
    • Y10S903/904—Component specially adapted for hev
    • Y10S903/907—Electricity storage, e.g. battery, capacitor

Abstract

The present invention relates to an over-discharge prevention apparatus and method for a vehicle battery, which can safely protect not only a 12V lithium ion battery but also each controller in a vehicle by performing a control such that a finish (shut off) sequence of each controller in the vehicle is executed when a relay for preventing over-discharge of a battery (for example, a 12V lithium ion battery) that supplies power to an electric load of the vehicle is turned off. To this end, an over-discharge prevention device for a vehicle battery according to the present invention includes: a voltage sensor that detects a voltage of the battery; an overdischarge prevention relay for a battery; a power state detector for detecting the on state of the ignition switch; and a controller that outputs a warning message when the voltage of the battery reaches a first threshold value in the on state of the ignition switch, and then turns off the relay after transmitting an end instruction to each electronic control unit through the vehicle network when the voltage of the battery reaches a second threshold value.

Description

Over-discharge preventing device and method for vehicle battery
Technical Field
The present invention relates to an over-discharge prevention device for a vehicle battery and a method thereof, and more particularly, to the following technology: when a relay for preventing overdischarge of a battery (for example, a 12V lithium ion battery) that supplies power to an electric load of a vehicle is turned off, the controller is controlled so that an end (shut off) timing of each controller in the vehicle is executed, thereby not only safely protecting the 12V lithium ion battery but also safely protecting each controller.
The present invention is applicable to eco-friendly vehicles that run by driving a motor using a high-voltage battery, including HEV (Hybrid Electric Vehicle), EV (Electric Vehicle), PHEV (Plug-in Hybrid Electric Vehicle), FCEV (Fuel Cell Electric Vehicle), and the like.
Background
In general, an eco-vehicle has a high-voltage battery for supplying a power source for driving; and an auxiliary battery for supplying an operating power to internal electrical devices (electrical loads). At this time, a Low voltage DC-DC Converter (LDC) connected to the auxiliary battery and the electric device reduces (down converting) the high voltage of the high voltage battery to a charging voltage of the auxiliary battery to charge the auxiliary battery when the voltage of the auxiliary battery does not exceed a reference value under the control of the upper controller.
Such an auxiliary battery functions as follows: the operating power is supplied not only during the start of the vehicle but also to various electric devices such as lamps, systems, and ECUs (Electronic Control Units).
Up to now, as for the auxiliary battery of the vehicle, a lead-acid storage battery (lead-acid storage battery) has been mainly used based on the advantage that it can be used by being recharged even if it is completely discharged, but such a lead-acid storage battery is heavy and has a low charge density, and particularly lead-acid is an environmental pollutant, and therefore, it has recently been replaced with a lithium ion battery (lithium ion battery) in an environmentally friendly vehicle.
However, since lithium ion batteries have a disadvantage that their performance is seriously degraded when they are recharged after overdischarge, in order to solve this disadvantage, a technology for preventing overdischarge of a lithium ion Battery by providing a Battery Management System (BMS) with an overdischarge prevention relay has been developed.
As a conventional technology, there is a technology for protecting a battery by turning off a relay when the battery for a vehicle is in an overdischarge state, but this is a technology simply used for protecting the battery for a vehicle, and there is a problem that each controller in the vehicle that operates in an Ignition On state cannot be protected.
Disclosure of Invention
Problems to be solved by the invention
In order to solve the above-described problems of the prior art, an object of the present invention is to provide an over-discharge prevention device for a vehicle battery and a method thereof, the device including: when a relay for preventing overdischarge of a battery (for example, a 12V lithium ion battery) that supplies power to an electric load of a vehicle is turned off, the controller in the vehicle is controlled so that a finish (shut off) timing of each controller in the vehicle is executed, and thus not only the 12V lithium ion battery but also each controller in the vehicle can be safely protected.
The object of the present invention is not limited to the above object, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and can be further clarified by the embodiments of the present invention. Further, it is understood that the objects and advantages of the present invention can be achieved by the means and combinations thereof within the scope of the claims.
Means for solving the problems
As an apparatus of the present invention for achieving the above object, there is provided an overdischarge prevention apparatus of a vehicle battery, including: a voltage sensor that detects a voltage of the battery; an overdischarge prevention relay for a battery; a power state detector for detecting the on state of the ignition switch; and a controller that outputs a warning message when the voltage of the battery reaches a first threshold value in the on state of the ignition switch, and then turns off the relay after transmitting an end command to each ECU (Electronic Control unit) through a vehicle network when the voltage of the battery reaches a second threshold value.
As a method of the present invention for achieving the above object, there is provided an overdischarge prevention method of a battery for a vehicle, including: a step in which a power source state detector detects the on state of an ignition switch; detecting the voltage of the battery by a voltage sensor; a step in which the controller outputs a warning message when the voltage of the battery reaches a first threshold value in the on state of the ignition switch; transmitting an end command to each ECU (Electronic Control unit) through a vehicle network by the controller when the voltage of the battery reaches a second threshold value; and a step in which the controller turns off an overdischarge prevention relay of the battery.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention as described above has the following effects: when a relay for preventing overdischarge of a battery (for example, a 12V lithium ion battery) that supplies power to an electric load of a vehicle is turned off, the controller in the vehicle is controlled so that a finish (shut off) timing of each controller in the vehicle is executed, and thus not only the 12V lithium ion battery but also each controller in the vehicle can be safely protected.
In addition, the present invention has the following effects: the relay is prohibited from being turned off in a state where the vehicle is in a started or running state, thereby achieving not only safety of the vehicle but also safety of passengers in the vehicle.
Drawings
Fig. 1 is a structural view of an embodiment of an over-discharge prevention apparatus for a vehicle battery according to the present invention,
fig. 2 is a flowchart of an embodiment of an over-discharge prevention method for a vehicle battery according to the present invention.
Reference numerals
100: battery with a battery cell
110: voltage sensor
120: relay with a movable contact
130: current sensor
140：J/B
150: power supply state detector
160: switch with a switch body
170: controller
Detailed Description
The above objects, features and advantages will be more clearly understood by those skilled in the art from the detailed description given with reference to the accompanying drawings, and thus the technical idea of the present invention can be easily implemented. In the description of the present invention, when it is determined that a specific description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a block diagram of an embodiment of an over-discharge prevention device for a vehicle battery according to the present invention.
As shown in fig. 1, the over-discharge preventing apparatus for a vehicle battery according to the present invention includes a battery 100, a voltage sensor 110, a relay 120, a current sensor 130, an engine room Junction Box (J/B) 140, a power state detector 150, a switch 160, a controller 170, and the like.
When looking at the above-described constituent elements, battery 100 may be a 12V lithium ion battery (low-voltage auxiliary battery) as an example, and supplies a required power supply to an electric load of a vehicle. Such a battery 100 can also be realized by a lead-acid battery.
In addition, voltage sensor 110 detects the voltage of battery 100.
In addition, the relay 120 performs a role of supplying or cutting off power from the battery 100 to an electric load, thereby preventing overdischarge of the battery 100 and also being able to completely cut off the battery 100 from a dark current flowing through the electric load. At this time, the relay 120 can be implemented by a self-locking (Latching Type) relay controlled by a Pulse (Pulse) signal.
Further, current sensor 130 is located between relay 120 and engine compartment junction box 140, and detects the current of battery 100.
In addition, the engine room junction box 140 includes a line for branching the power supply of the battery 100 to each electrical load. Specifically, the operating power is supplied to the power status detector 150.
Further, the power supply state detector 150 detects a state in which the power supply of the battery 100 is supplied to the electric load (hereinafter, power supply state). In this case, the power state includes four states of Lock (Lock), accessory ON (ACC), ignition ON (ON), and Start (Start), which are also applicable to both the Start key mode and the Start button mode. In the present invention, the ignition switch on state indicates a state in which the power source of the battery is supplied to the electric load in the vehicle.
The switch 160 is a Passive (Passive) switch, and is operated by a user operation to turn on the relay 120. That is, when the driver gets into the vehicle and turns on the switch 160 in a state where the controller 170 turns off the relay 120 in order to prevent the over-discharge of the battery 100, the relay 120 is turned on and the power from the battery 100 is supplied to the electric load.
The controller 170 performs overall control so that each of the above-described constituent elements can normally perform its own function.
In particular, in order to prevent overdischarge of battery 100 that supplies power to an electric load of the vehicle, controller 170 turns off relay 120 using switch 171 provided inside.
That is, as the relay-off preparation step, when the voltage of the battery 100 reaches the first threshold (e.g., 11V) in the ignition-on state, the controller 170 outputs a warning message guiding the driver to start through the instrument panel (cluster).
Thereafter, as a relay opening step, when the vehicle is not started by the driver and the voltage of the battery 100 reaches a second threshold value (a value lower than the first threshold value (e.g., 10.5V)), the controller 170 transmits an end (shut off) command to an Electronic Control Unit (ECU) in the vehicle through the vehicle network, and then opens the relay 120. In this case, the controller 170 may turn off the relay 120 after receiving the completion message from each ECU in the vehicle, may monitor the output of the ECU through the vehicle network, and may turn off the relay 120 when the ECU does not operate, or may turn off the relay 120 when a predetermined time has elapsed after transmitting the completion command to each ECU in the vehicle.
Here, the vehicle Network may include CAN (Controller Area Network), LIN (Local Interconnect Network), FlexRay, MOST (Media Oriented System Transport), and the like.
Thereafter, when the ignition switch is turned on after the driver turns on the relay using the switch 160, the controller 170 outputs a warning message through the instrument panel, and performs a post-processing process of turning off the relay 120 again when the vehicle is not started within a time threshold.
The post-processing procedure can be repeatedly executed for the set number of times, and in this case, it is preferable to set the time threshold to be shorter as the number of times of repeated execution. For example, when the number of times of the repeated execution is three, the first time may be set to 3 minutes, the second time to 1 minute, and the third time to 30 seconds.
When the number of times exceeds the set number, the use of the battery 100 is completely shut off. Thereafter, battery 100 can only be used if an A/S serviceman directly accesses the system and removes the disconnection.
The present invention is preferably configured so as not to operate for the safety of the driver while the vehicle is traveling. However, when the over-discharge of the battery 120 is detected, the vehicle can be brought into a limp home mode (emergency control mode or safety mode).
In addition, in the present invention, each ECU in the vehicle executes an end timing for stable end of the system in accordance with the end command.
Fig. 2 is a flowchart of an embodiment of an over-discharge prevention method for a vehicle battery according to the present invention.
First, the power state detector 150 detects the on state of the ignition switch (201).
After that, voltage sensor 110 detects the voltage of battery 100 (202).
Thereafter, when the voltage of battery 100 reaches a first threshold (e.g., 11V) in the ignition-on state, controller 170 outputs a warning message (203).
When the voltage of the battery 100 reaches a second threshold value (for example, 10.5V) with the elapse of time, the controller 170 transmits an end (Shut off) command to each ECU (Electronic Control Units) through the vehicle network (204).
After that, the controller 170 turns off the overdischarge prevention relay 120 of the battery 100 (205).
By performing control so as to execute the end (shut off) timing of each controller in the vehicle through such a procedure, not only the 12V lithium ion battery but also each controller in the vehicle can be safely protected.
On the other hand, the method of the present invention as described above can be implemented as a computer program. And codes and code segments constituting the above programs can be easily reversed by computer programmers in the corresponding fields. The program created as described above is stored in a computer-readable recording medium (information storage medium), and is read and executed by a computer, thereby realizing the method of the present invention. The recording medium includes all types of recording media that can be read by a computer.
The present invention described above is not limited to the above-described embodiments and drawings, since various substitutions, modifications, and changes can be made by those skilled in the art without departing from the technical spirit of the present invention.

Claims (12)

1. An overdischarge prevention apparatus for a vehicle battery, comprising:
a voltage sensor that detects a voltage of the battery;
an overdischarge prevention relay for a battery;
a power state detector for detecting the on state of the ignition switch; and
a controller that outputs a warning message when the voltage of the battery reaches a first threshold value in an on state of the ignition switch, and then turns off the relay under one of the following conditions after transmitting an end instruction to each electronic control unit through a vehicle network when the voltage of the battery reaches a second threshold value:
opening the relay after receiving a completion message from each electronic control unit in the vehicle;
monitoring the operation of each electronic control unit through a vehicle network, and disconnecting the relay when each electronic control unit does not operate; and
the relay is turned off when a first time threshold value has elapsed after the end command is transmitted to each electronic control unit in the vehicle,
wherein the second threshold is less than the first threshold,
wherein the over-discharge prevention apparatus of the vehicle battery further includes a passive switch for turning on the relay,
wherein the controller outputs the warning message again through the instrument panel when the relay is turned on by the passive switch and the ignition switch is turned on, and performs a post-processing process of turning off the relay again when the vehicle is not started within a second time threshold.
2. The overdischarge prevention apparatus for a vehicle battery according to claim 1, wherein:
the controller repeatedly performs the post-processing procedure up to a set number of times, and completely cuts off the use of the battery when the set number of times is exceeded.
3. The overdischarge prevention apparatus for a vehicle battery according to claim 2, wherein:
the more the number of iterations, the shorter the second time threshold is set by the controller.
4. The overdischarge prevention apparatus for a vehicle battery according to claim 1, wherein:
the battery is a 12V lithium ion battery.
5. The overdischarge prevention apparatus for a vehicle battery according to claim 1, wherein:
the relay is a self-locking relay controlled by a pulse signal.
6. The overdischarge prevention apparatus for a vehicle battery according to claim 1, wherein:
the vehicle network is any one of CAN, LIN, FlexRay, MOST.
7. An overdischarge prevention method of a battery for a vehicle, comprising:
a step in which a power source state detector detects the on state of an ignition switch;
detecting the voltage of the battery by a voltage sensor;
a step in which the controller outputs a warning message when the voltage of the battery reaches a first threshold value in the ignition switch on state;
transmitting, by the controller, an end instruction to each electronic control unit through a vehicle network when the voltage of the battery reaches a second threshold value; and
the controller turns off the overdischarge prevention relay of the battery under one of the following conditions:
opening the relay after receiving a completion message from each electronic control unit in the vehicle;
monitoring the operation of each electronic control unit through a vehicle network, and disconnecting the relay when each electronic control unit does not operate; and
the relay is turned off when a first time threshold value has elapsed after the end command is transmitted to each electronic control unit in the vehicle,
wherein the second threshold is less than the first threshold,
wherein the method further comprises:
a step of turning on the relay by a passive switch; and
and a step of executing a post-processing procedure of turning off the relay again when the vehicle is not started within a second time threshold.
8. The overdischarge prevention method of a vehicle battery according to claim 7, characterized in that:
the post-processing is repeatedly performed up to a set number of times, and when the set number of times is exceeded, the use of the battery is completely cut off by the controller.
9. The overdischarge prevention method of a vehicle battery according to claim 8, characterized in that:
in the post-processing, the more the number of repetitions, the shorter the second time threshold is set.
10. The overdischarge prevention method of a vehicle battery according to claim 7, characterized in that:
the battery is a 12V lithium ion battery.
11. The overdischarge prevention method of a vehicle battery according to claim 7, characterized in that:
the relay is a self-locking relay controlled by a pulse signal.
12. The overdischarge prevention method of a vehicle battery according to claim 7, characterized in that:
the vehicle network is any one of CAN, LIN, FlexRay, MOST.
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